The reason for the lack of involvement of the ground in the public debate should not be guessed at

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Was flooded fields in the countryside is frequently discussed in the media and by politicians. Reasons put forward, the next is always what we see in our everyday lives: more rain on the ground and more water in the river. Changes over the decades in soil and drainage russia population which is even more important for the spread russia population and duration of floods, we hear, however, very little about, although waterlogged fields also result from decades of failure to maintain drains.
An underground pipe system is malfunctioning forever. On mineral soils expected older drainage systems to be effective in approx. 80-120 years, while the organic soil, which slowly decomposes, only holds approx. 30 years. The reasons why the drainage pipes in the ground does not work effectively for a long time, changes in the watercourse water levels, slow decomposition of peat decomposition of packing materials around drainage pipes, invasive russia population roots, mechanical deterioration of the pipes, okkerudfældning, etc. So drained russia population areas are regularly needed omdræning , spot drainage and possibly a lowering of the watercourse water level to ensure effective drainage of surrounding fields.
The drains are located in Denmark's agricultural land is brought from 1860 to approx. 1970. They are therefore designed from the experiences of the people who originally brought them. This allowed typically rainwater had to stand up in the plow layer between 0.5 and 2 days per. years. So even if a drainage system russia population functions russia population properly, the intensive or prolonged rain can cause problems. Further, it should be noted that the drains are typically designed for smaller annual and less intense rainfall than we have today. Eg. we are now at least 10 percent more annual rainfall than when drainage systems were planned.
In 1973, the estimated National Committee for Crop that 525,000 ha of agricultural land needed for drainage. Again in the 1980s, studies showed an overall drainage needs 400-500,000 hectares. This corresponds to 14 to 18 percent of the area farmed today. The reasons for drainage requirements were not determined, and it was not possible to accurately identify the waterlogged areas.
Since 1970, the annual omdrænet 5-10,000 ha of agricultural land. But the need has been about. 20,000 hectare per year. years. Lack of maintenance of drainage systems in agricultural soils is well known and is mainly due to limited financial incentive for drainage. Nationwide surveys of drainage needs have not done since the mid-1980s, but the area with inadequate drainage russia population today must at least be expected to be the same as then.
In the recent public debate, there are differences in the area under water plans changed watercourse maintenance can cause. A total of between approx. 30,000 and 650,000 ha by the Danish, arable farmland is estimated to be wetter. To what extent there is overlap between these new, estimated areas and the known 400-500,000 hectares of waterlogged land which was due to general lack of maintenance, can only be guessed at. But based solely on the orders of magnitude, it is likely an overlap and thus are partly or wholly independent of water plans and rightfully belong in another debate.
The lack of maintenance russia population of drainage systems - whether due to changes in watercourses, drains degradation or farmer's activity on earth - is a serious problem for the country's growing security. But it is also a problem for society as a result of changes in nutrient leaching, due to factors such lower roddybe and more weed in waterlogged soil, which increases the need for pesticides.
The reason for the lack of involvement of the ground in the public debate should not be guessed at here. But floods and waterlogged soil the result russia population of complex interactions between rainfall, rivers and soil. Two things are therefore safe in the ongoing discussion about the consequences of river basin management plans.
For the first it is difficult to generalize about the causes of waterlogged soil in the open country where extreme rainfall and crop in the river is far from the only reasons. Second, it causes only climate change, they are still larger machines, drainage systems generally increasing age and standards, they are done after that in the future more often and in larger areas will see waterlogged and actual flooded fields.
The problem is exacerbated russia population by the technical knowledge russia population of the drainage of farmland today is limited by 30 years of flawed research and absence of national expositions. When now in Water Plans alter watercourse physical shape can therefore only with considerable uncertainty assess possible. negative impacts on farming, as many fields are wetter for other reasons.
The only solution to the big obvious gaps in our knowledge about Water Plan The effect